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| 3c 454.3 (1) |
| acceleration of particles (1) |
| active galactic nucleus (1) |
| bl lacertae objects: general (1) |
| bl lacertae objects: individual (mrk 421) (1) |
| bl-lacertae objects (1) |
| black-hole masses (1) |
| crab-nebula (1) |
| galaxies: active (1) |
| gamma rays: general (1) |